2011 North Dakota Energy Codes Carl Pedersen Energy Educator NDSU Extension Service Ag and Biosystems Engineering
The following training is brought to you by the North Dakota Association of Builders courtesy of the North Dakota Department of Commerce: Office of Renewable Energy & Energy Efficiency in cooperation the North Dakota State University Extension Service. The following information is an interpretation of information contained in the International Residential Code and the International Energy Conservation Code. NDSU, nor any its employees are responsible for the accuracy, completeness, or interpretation of any information contained. Acknowledgement This material is based upon work supported by the US Department of Energy State Energy Program 08 NT43202 Disclaimer The report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state of reflect those of the United States Government or any agency thereof.
Today s Topics Building Science Scope IRC vs IECC Specific Requirements Performance alternative Documentation
Building Science Heat Loss Warm to cold Path of least resistance 70 F 10 F ΔT = 60
Heat Transfer Conduction collisions (R-value) Convection currents Radiation waves
Air Movement
Moisture Movement More to less Indoor 40-60% Wet soil 100% Building materials Concrete Wood 100%
Which way is the foundation going to dry?
International Codes N1101.2 401.2 North Dakota Amendments
Must it comply? Mandatory requirements Air leakage, insulation and systems IRC IECC Prescriptive Performance R-value U-value Inspection to occupancy
Varies by Jurisdiction Building codes are not consistent throughout North Dakota Check with local code officials!!!!!! Information covered in this presentation is for the North Dakota State Building Code
IRC and IECC IECC addresses only energy IRC addresses all topics (structural, plumbing, etc.) Allows builder to carry only one code book Chapter 11 covers energy efficiency IRC allows compliance with IECC as an alternative to Chapter 11 IECC addresses both residential and commercial; IRC addresses subset of residential detached one- and twofamily dwellings and townhouses 3 stories or fewer Energy requirements in IRC and IECC almost identical IRC has less stringent foundation requirements in northern zones
IRC and IECC IRC has amendments in North Dakota, IECC does not. IRC IECC Walls R-19 Walls R-20 (Zone 6) or R-21 (zone 7) No duct testing requirement Duct leakage testing required No programmable thermostat requirement No high efficacy light requirement Programmable thermostat required 50% high efficacy light requirement
Scope IRC N1101.1 Residential Buildings One and two family homes Separate egress Less than 3 stories above grade Pg 455
Scope IECC 1263068 Residential Buildings: IECC has one- and twofamily R-2, R-3, R-4 3 stories All buildings that are not residential by definition are commercial Includes additions, alterations, renovations and repairs 1831523
Quiz Is this residential? IRC or IECC?
Quiz Is this residential? IRC or IECC?
Scope Exempted Buildings Very low energy use buildings (<3.4 Btu/h-ft 2 or 1 watt/ft 2 ) Buildings (or portions of) that are neither heated nor cooled Existing buildings (Section 101.4.1 IECC) Electrical power, lighting, and mechanical systems still apply Buildings designated as historic (Section 101.4.2 IECC)
Scope - Additions, Alterations, Renovations, Repairs Code applies to any new construction Unaltered portion(s) do not need to comply Additions can comply alone or in combination with existing building Replacement fenestration that includes both glazing and sash must meet U-factors in all Zones
Scope - Additions, Alterations, Renovations, Repairs Exceptions Storm windows over existing fenestration Glass-only replacements Exposed, existing ceiling, wall or floor cavities if already filled with insulation Where existing roof, wall or floor cavity isn t exposed
Scope - Additions, Alterations, Renovations, Repairs Exceptions (IECC) Reroofing for roofs where neither sheathing nor insulation exposed Insulate above or below the sheathing Roofs without insulation in the cavity Sheathing or insulation is exposed Provided installed interior lighting power isn t increased and < 50% of luminaires in a space are replaced (IECC) Only bulb and ballast within existing luminaires in a space are replaced
Space Conditioning Non-conditioned to conditioned. Examples: - Converting a garage to a family room - Heating a basement
Scope - Mixed Use Buildings IECC Treat the residential occupancy under the applicable residential code Treat the commercial occupancy under the commercial code
Quiz Is this residential? IRC or IECC?
Overview of Structure Climate-Specific Requirements: Foundations Basements Slabs Crawlspaces Above grade walls Skylights, windows, and doors Roofs Universal Requirements (apply everywhere): Duct insulation and sealing Infiltration control
North Dakota Climate Zones Zone 7 Zone 6
Overview of Residential Code Requirements Focus is on building envelope Ceilings, walls, windows, floors, foundations Sets insulation and fenestration levels Infiltration control - caulk and seal to prevent air leaks Ducts seal and insulate Limited space heating, air conditioning, and water heating requirements Federal law sets most equipment efficiency requirements, not the I-codes No appliance requirements Lighting equipment 50% of lamps to be high-efficacy lamps. Amended Out!!!!!!!
CLIMATE ZONE FENESTRATION U-FACTOR b SKYLIGHT b U-FACTOR Insulation and Fenestration Requirements by Climate Zone Table N1102.1(IRC) or 402.1.1(IECC) Insulation and Fenestration Requirements by Component GLAZED FENESTRATION b,e SHGC CEILING R-VALUE WOOD FRAME WALL R-VALUE MASS WALL R-VALUE i FLOOR R- VALUE BASEMENT c WALL R-VALUE SLAB d R-VALUE & DEPTH CRAWL SPACE c WALL R-VALUE 1 1.20 0.75 0.30 30 13 3 / 4 13 0 0 0 2 0.65 j 0.75 0.30 30 13 4 / 6 13 0 0 0 3 0.50 j 0.65 0.30 30 13 5 / 8 19 5 / 13 f 0 5 / 13 4 except 0.35 0.60 NR 38 13 5 / 10 19 10 / 13 10, 2ft 10 / 13 Marine 5 and 0.35 0.60 NR 38 20 or 13+5 h 13 / 17 30 g 10 / 13 10, 2 ft 10 / 13 Marine 4 6 0.35 0.60 NR 49 20 or 13+5 h 15 / 19 30 g 15 / 19 10, 4 ft 10 / 13 7 and 8 0.35 0.60 NR 49 21 19 / 21 38 g 15 / 19 10, 4 ft 10 / 13 a. R-values are minimums, U-factors and SHGC are maximums, R-19 batts compressed into a nominal 2 x 6 framing cavity such that the R-value is reduced by R-1 or more shall be marked with the compressed batt R-value in addition to the full thickness R-value. b. The fenestration U-factor column excludes skylights. The SHGC column applies to all glazed fenestration. c. 15/19 means R-15 continuous insulated sheathing on the interior or exterior of the home or R-19 cavity insulation at the interior of the basement wall. 15/19 shall be permitted to be met with R-13 cavity insulation on the interior of the basement wall plus R-5 continuous insulated sheathing on the interior or exterior of the home. 10/13 means R-10 continuous insulated sheathing on the interior or exterior of the home or R-13 cavity insulation at the interior of the basement wall. d. R-5 shall be added to the required slab edge R-values for heated slabs. Insulation depth shall be the depth of the footing or 2 feet, whichever is less in Zones 1 through 3 for heated slabs. e. There are no SHGC requirements in the Marine Zone. f. Basement wall insulation is not required in warm-humid locations as defined by Figure 301.1 and Table 301.1. g. Or insulation sufficient to fill the framing cavity, R-19 minimum. h. 13+5 means R-13 cavity insulation plus R-5 insulated sheathing. If structural sheathing covers 25 percent or less of the exterior, insulating sheathing is not required where structural sheathing is used. If structural sheathing covers more than 25 percent of exterior, structural sheathing shall be supplemented with insulated sheathing of at least R-2. i. The second R-value applies when more than half the insulation is on the interior of the mass wall. j. For impact rated fenestration complying with Section R301.2.1.2 of the IRC or Section 1608.1.2 of the IBC, maximum U-factor shall be 0.75 in Zone 2 and 0.65 in Zone 3. Pg 468
North Dakota IRC Amendments Table R1102.1 Revise as follows: For climate zones 6,7, and 8, under Wood Frame Wall R-Value column, delete listed values and replace with R-19 in both cases. Section N1103.1.1 - Section N1103.1.1 is hereby deleted in its entirety. Removes requirement for programmable thermostats Section N1103.2.2 Revise as follows: Removes duct testing requirement Section N1104.1 - Section N1104.1 is hereby deleted in its entirety. Removes requirement for high efficacy lights (CFLs,etc)
CLIMATE ZONE FENESTRATION U-FACTOR b SKYLIGHT b U-FACTOR Insulation and Fenestration Requirements by Climate Zone Table N1102.1(IRC) or 402.1.1(IECC) Insulation and Fenestration Requirements by Component GLAZED FENESTRATION b,e SHGC CEILING R-VALUE WOOD FRAME WALL R-VALUE MASS WALL R-VALUE i FLOOR R- VALUE BASEMENT c WALL R-VALUE SLAB d R-VALUE & DEPTH CRAWL SPACE c WALL R-VALUE 1 1.20 0.75 0.30 30 13 3 / 4 13 0 0 0 2 0.65 j 0.75 0.30 30 13 4 / 6 13 0 0 0 3 0.50 j 0.65 0.30 30 13 5 / 8 19 5 / 13 f 0 5 / 13 4 except 0.35 0.60 NR 38 13 5 / 10 19 10 / 13 10, 2ft 10 / 13 Marine 5 and Marine 4 0.35 0.60 NR 38 20 or 13+5 h 13 / 17 30 g 10 / 13 10, 2 ft 10 / 13 6 0.35 0.60 NR 49 20 or 13+5 h 15 / 19 30 g 15 / 19 10, 4 ft 10 / 13 7 and 8 0.35 0.60 NR 49 19 21 19 / 21 38 g 15 / 19 10, 4 ft 10 / 13 a. R-values are minimums, U-factors and SHGC are maximums, R-19 batts compressed into a nominal 2 x 6 framing cavity such that the R-value is reduced by R-1 or more shall be marked with the compressed batt R-value in addition to the full thickness R-value. b. The fenestration U-factor column excludes skylights. The SHGC column applies to all glazed fenestration. c. 15/19 means R-15 continuous insulated sheathing on the interior or exterior of the home or R-19 cavity insulation at the interior of the basement wall. 15/19 shall be permitted to be met with R-13 cavity insulation on the interior of the basement wall plus R-5 continuous insulated sheathing on the interior or exterior of the home. 10/13 means R-10 continuous insulated sheathing on the interior or exterior of the home or R-13 cavity insulation at the interior of the basement wall. d. R-5 shall be added to the required slab edge R-values for heated slabs. Insulation depth shall be the depth of the footing or 2 feet, whichever is less in Zones 1 through 3 for heated slabs. e. There are no SHGC requirements in the Marine Zone. f. Basement wall insulation is not required in warm-humid locations as defined by Figure 301.1 and Table 301.1. g. Or insulation sufficient to fill the framing cavity, R-19 minimum. h. 13+5 means R-13 cavity insulation plus R-5 insulated sheathing. If structural sheathing covers 25 percent or less of the exterior, insulating sheathing is not required where structural sheathing is used. If structural sheathing covers more than 25 percent of exterior, structural sheathing shall be supplemented with insulated sheathing of at least R-2. i. The second R-value applies when more than half the insulation is on the interior of the mass wall. j. For impact rated fenestration complying with Section R301.2.1.2 of the IRC or Section 1608.1.2 of the IBC, maximum U-factor shall be 0.75 in Zone 2 and 0.65 in Zone 3. Pg 468
Pg 27 Prescriptive R-values 19 Pg 468
Envelope Insulation N1101.4 Mark each piece greater than 12 --- or --- Certificate Type Manufacturer R-value for each piece of building envelope Sign, date and Post Pg. 455
Envelope Certification N1101.4 Blown Installer must certify Thickness (pre-post) R-value Coverage Amount used Markers (N1101.4.1) Sign, date and post Pg. 455
Fenestration labeling N1101.5 NFRC label Default tables for fenestrations Used with no identifications IRC page 455 and 467
Installation N1101.7 According to manufacturers instructions N1101.7.1 protection of exterior basement insulation 6 inches below grade Pg 455
Certificate N1101.9 Permanently posted on or in the electrical distribution panel Don t cover or obstruct the visibility of other required labels Includes the following: R-values walls, roof/ceiling, foundation/basement/slab Thermal envelope U-factors for fenestration HVAC efficiencies and types SWH equipment Pg 455
Certificate (cont d) Certificate lists gas-fired unvented room heater, electric furnace, or baseboard electric heater, rather than listing an efficiency for those heating types
Insulation and Fenestration Requirements N1102.1 Meet requirements of Table N1102.1 19 Pg. 468
U-Factor and Total UA Alternatives N1102.1.2-.3 U-factor Alternative (Assemblies) Similar to Prescriptive R-Value but uses U-factors instead. Allows for innovative or less common construction techniques such as structural insulated panels or advanced framing Allows no trade offs between building components Total UA Alternative Same as U-factor alternative but allows trade-offs across all envelope components Primary approach used in REScheck software UA U factor x area of assembly U= 1/R
Locations with Window SHGC Requirements 0.30 SHGC
Requirements by Climate Zone (U-Factor Table) Table N1102.1.1 (IRC) -402.1.3(IECC) Equivalent U-Factors CLIMATE FENESTRATION SKYLIGHT CEILING FRAME MASS FLOOR BASEMENT CRAWL ZONE U-FACTOR U-FACTOR U-FACTOR WALL WALL U-FACTOR WALL SPACE U-FACTOR U- U-FACTOR d WALL FACTOR b U-FACTOR c 1 1.20 0.75 0.035 0.082 0.197 0.064 0.360 0.477 2 0.65 0.75 0.035 0.082 0.165 0.064 0.360 0.477 3 0.50 0.65 0.035 0.082 0.141 0.047 0.091 c 0.136 4 except 0.35 0.60 0.030 0.082 0.141 0.047 0.059 0.065 Marine 5 and 0.35 0.60 0.030 0.057 0.082 0.033 0.059 0.065 Marine 4 6 0.35 0.60 0.026 0.057 0.060 0.033 0.050 0.065 7 and 8 0.35 0.60 0.026 0.057 0.057 0.028 0.050 0.065 a. Nonfenestration U-factors shall be obtained from measurement, calculation or an approved source. b. When more than half the insulation is on the interior, the mass wall U-factors shall be a maximum of 0.17 in Zone 1, 0.14 in Zone 2, 0.12 in Zone 3, 0.10 in Zone 4 except Marine, and the same as the frame wall U-factor in Marine Zone 4 and Zones 5 through 8. c. Basement wall U-factor of 0.360 in warm-humid locations as defined by Figure 301.1 and Table 301.2.
Compliance - Three Options Prescriptive R-values 1102.1 402.1.1 U-Factor and UA Alternatives U-factor 402.1.3 Total Building UA 402.1.4 Simulated Performance (software) IECC Simulated Performance Alternative 405
Code Compliance Tools Prescriptive Total Building UA Trade-off Energy Analysis Checklist REScheck Software (Web-based & Desktop) Software (example): REM/Design REM/Rate EnergyGauge
Building Envelope Specific Requirements Building Envelope consists of: Ceilings Walls Above grade Below grade Mass walls Fenestration Floors Slab Crawl space
Pg. 469 Ceilings N1102.2.1 Requirements based on Assembly type Continuous insulation Insulation between framing (cavity insulation) Meet or exceed R-values
Ceilings Blown-in certificate at or near the opening of the attic. The certificate should include: R-value of installed thickness initial installed thickness installed density settled thickness/settled R-value coverage area number of bags installed Markers every 300 square feet Uniformly throughout and extends over top of the exterior wall.
Insulation Ceilings with Attics N1102.2.1 R-49 Ceiling insulation requirements in R-value table assume standard truss systems Possibility of ice dam formations Insulation Cold corners contribute to condensation and mold growth in some locations
Insulation Ceilings with Attics, Cont d. Insulation at full thickness over exterior walls Insulation Prescriptive R-value path encourages raised heel truss (aka, energy truss) If insulation is full height over exterior wall top plate R-38 complies where R-49 is required Note: This allowance ONLY applies to the R-value prescriptive path, not the U-factor or Total UA alternatives
Ceilings without Attics (e.g., vaulted) N1102.2.2 Not sufficient amount of space to meet higher levels R-30 allowed for 500 ft 2 or 20% total insulated ceiling area, whichever is less
Access Hatches and Doors (Prescriptive) N1102.2.3 Weatherstrip and insulate Insulate to level equivalent to surrounding surfaces e.g., required ceiling insulation = R-49, then attic hatch must be insulated to R-49 Install retainer when loose fill insulation is installed
Walls Covered Exterior above-grade walls Attic kneewalls Skylight shaft walls Perimeter joists Basement walls Garage walls (shared with conditioned space)
Above Grade Walls
Wood-Frame Walls Required R-value can be met with any combination of cavity or continuous insulation Exception in zones 5-6: R-13 cavity plus R-5 sheathing meets R-20 requirement 19 19
Mass Wall Requirements N1102.2.4 Second (higher) number applies when more than half the R-value is on the interior of the mass (i.e., when the thermal mass is insulated from the conditioned space) Outside/inside
Mass Walls What type Concrete block, concrete, insulated concrete form (ICF), masonry cavity, brick (other than brick veneer), earth, and solid timber/logs
Steel-frame N1102.2.5 Table N1102.2.5(IRC) 402.2.5(IECC) Steel-Frame Ceiling, Wall and Floor Insulation(R-Value) Ceilings, walls, and floors Wood Frame R-value R-30 R-38 R-49 R-30 R-38 R-13 R-19 R-21 R-13 R-19 Steel Truss Ceilings R-49 or R-38 + 3 R-38 + 5 Steel Joist Ceilings R-38 in 2x4, or 2x6, or 2x8 R-49 any framing R-49 2x4, or 2x6, or 2x8, or 2x10 Steel Framed Wall Steel Joist Floor Cold-Formed Steel Equivalent R-value R-38 or R-30 + 3 or R-26 + 5 R-13 + 5 or R-15 +4, or R-21 +3 or R-0+10 R-13 + 9 or R-19 +8 or R-25 +7 R-13 +10 or R-19 +9 or R-25 +8 R-19, 2x6 R-19 + 6 in 2x8 or 2x10 R-19 + 6 in 2x6 R-19 +12 in 2x8 or 2x10
Steel Frame Walls (and ceilings, floors) Table N1102.1(IRC) 402.2.5 (IECC) Steel-Frame Ceiling, Wall and Floor Insulation (R-Value) Wood Frame R-value Cold-Formed Steel Equivalent R-value a Steel Truss Ceilings b R-30 R-38 or R-30 + 3 or R-26 + 5 R-38 R-49 R-30 R-38 R-49 2x4, or 2x6, or 2x8, or 2x10 Steel Framed Wall Table keys on the wood-frame R-13 R-13 + 5 R-15 +4, R-21 +3 or R-0+10 requirement for the corresponding R-19 R-13 + 9 or R-19 +8 or R-25 +7 building R-21 component R-13 +10 or R-19 +9 or R-25 +8 R-13 R-19 R-38 + 5 Steel Joist Ceilings b Steel Joist Floor R-49 or R-38 + 3 R-38 in 2x4, or 2x6, or 2x8 R-49 any framing R-19, 2x6 R-19 + 6 in 2x8 or 2x10 R-19 + 6 in 2x6 R-19 +12 in 2x8 or 2x10 In ceilings, insulation that exceeds the height of the framing must cover the framing
Floors Over Unconditioned Space N1102.2.6 Exception: If framing members are too small to accommodate R-30, insulation that fills the framing cavity, not less than R-19, complies
Floors over Unconditioned Space N1102.2.6 Unconditioned space includes unheated basement, vented crawlspace, or outdoor air Climate zone IRC IECC 6 30 30 7 30 38 Insulation must maintain permanent contact with underside of subfloor * Exception: Climate Zones 4c-8 R-19 permitted if cavity completely filled
Defining Below-Grade Walls N1102.2.7 Basement Wall >50% below grade Below grade Basement wall Exterior Wall <50% below grade
Below-Grade Walls 19 continuous or /cavity 15/19 requirement can be met with R-13 cavity (interior) plus R-5 continuous (exterior)
Below-Grade Walls 50% below grade Otherwise treat as above- grade wall Insulated from top of basement wall down to 10 ft below grade or basement floor, whichever is less
Foundation Insulation
Foundation Insulation Interior Insulation Recommendations Must be able to dry to interior if it gets wet Must prevent interior air from reaching foundation wall Material in contact with foundation wall must be moisture tolerant.
Exterior Foundation Insulation
Interior Foundation Insulation- Rigid Insulation
Interior Foundation Insulation Rigid Insulation with fiberglass
Interior Foundation Insulation Spray Foam
Slab Edge Insulation N1102.2.8 Applies to slabs with a floor surface < 12 inches below grade R-10 (typically 2 inches) extend downward from top of slab a minimum 4 feet Insulation can be vertical or extend horizontally under the slab or out from the building Insulation extending outward must be under 10 inches of soil or pavement An additional R-5 is required for heated slabs Flashing Protection Board Figure 2 Slab Rigid Insulation Figure 3 Slab Rigid Insulation Figure 4 Slab Rigid Insulation
Slab Edge Insulation Bevel Cut Slab Rigid Insulation
Crawlspace Wall Insulation N1102.2.9 Implies an unvented crawlspaces (aka, conditioned crawlspace, mini basement) Space must be mechanically vented or receive minimal supply air (see Section R408 of the IRC) Exposed earth must be covered with a continuous Class I vapor retarder (Overlap 6 and taped)
Fenestration N1102.3 Doors and windows NFRC rating or default table U=.35 If no labeled U-factor and SHGC, use default table No glass area limits Exemptions (prescriptive path only) Up to 15 ft 2 of glazing per dwelling unit (Section N1102.3.3 or 402.3.3) One side-hinged opaque door assembly up to 24 ft 2 (Section N 1102.3.4 or 402.3.4) Pg. 470
Simulated Performance Alternative IECC Requires computer software with specified capabilities (local official may approve other tools) Includes both envelope and some systems, but not HVAC or water heater efficiency Allows greatest flexibility Can trade-off tight duct systems Defines compliance based on equivalency of calculated energy or energy cost Section 405 specifies ground rules These will generally be hidden in compliance software calculation algorithms Very similar ground rules are used in home federal tax credits and ENERGY STAR Home guidelines
Mandatory Requirements Air Leakage Building thermal envelope (Section 1102.4 or 402.4) Recessed lighting Fenestration Fireplaces N1102.4
Air Sealing and Insulation N1102.4.2 Two options to demonstrate compliance Whole-house pressure test Air leakage <7 ACH when tested at pressure differential of 0.2 inches w.c. Testing may occur any time after rough in and installation of building envelope penetrations Field verification of items listed in Table N1102.4.2(IRC) 402.4.2 (IECC).
Air Leakage Control Building thermal envelope Durably sealed Caulked Gasketed Weatherstripped Air barrier material Suitable film or solid material
Image courtesy of Energy Block
Areas for Air Leakage Windows and doors Sill plates Floors and exterior wall panels Plumbing Electrical Service access doors or hatches Recessed light fixtures Rim joist junction (Infiltration)
Fireplaces N1102.4.3 New wood-burning fireplaces shall have gasketed doors and outdoor combustion air.
Fenestration Air Leakage N1102.4.4 Windows, sliding glass doors and skylights Air filtration rate < 0.3 cfm/ft 2 Swinging doors < 0.5 cfm/ft 2 Exceptions Site-built windows, skylights, and doors
Recessed Lighting Fixtures N1102.4.5 Type IC rated and labeled as meeting ASTM E 283 when tested at 1.57 psf (75 Pa) pressure differential with no more than 2.0 cfm of air movement Sealed with a gasket or caulk between the housing and interior wall or ceiling covering
Mechanical Systems & Equipment Equipment efficiency set by Federal law, not the I-Codes
Mandatory Requirements Systems (Section IECC 403) Controls Heat pump supplementary heat Ducts Sealing (Mandatory) Insulation (Prescriptive) HVAC piping insulation Circulating hot water systems Ventilation Equipment sizing Systems serving multiple dwelling units Snow melt controls Pools
Programmable Thermostat Controls ONLY IECC COMPLIANCE If primary heating system is a forced-air furnace At least one programmable thermostat/dwelling unit Capability to set back or temporarily operate the system to maintain zone temperatures down to 55ºF (13ºC) or up to 85ºF (29ºC) Initially programmed with: heating temperature set point no higher than 70ºF (21ºC) and cooling temperature set point no lower than 78ºF (26ºC)
Heat Pump Supplementary Heat - Controls Prevent supplementary electric-resistance heat when heat pump can meet the heating load Exception During defrost
Ducts N1103.2 Insulation (Prescriptive) Supply ducts in attics: R-8 All other ducts: R-6 Sealing (Mandatory) Joints and seams shall comply with IRC, Section M1601.4.1 Building framing cavities shall not be used as supply ducts
Duct Location Examples Location Requirement Attic R-8 Conditioned Space - Vented Crawl Space R-6 Conditioned Crawl Space - Basement Conditioned - Basement Unconditioned R-6 Exterior Walls R-6
All ducts, air handlers, filter boxes and building cavities used as ducts shall be sealed (Section 403.2.2) Duct tightness shall be verified by either Post construction test Leakage to outdoors: 8 cfm/per 100 ft 2 of conditioned floor area or Total leakage: 12 cfm/per 100 ft 2 of conditioned floor area tested at a pressure differential of 0.1 in w.g. (25Pa) across entire system, including manufacturer s air handler enclosure OR Duct Tightness Tests All register boots taped or otherwise sealed Rough-in test Total leakage 6 cfm/per 100 ft 2 of conditioned floor area tested at a pressure differential of 0.1 in w.g. (25Pa) across roughed-in system, including manufacturer s air handler enclosure all register boots taped or otherwise sealed if air handler not installed at time of test» Total air leakage 4 cfm/per 100 ft 2 Exceptions: Duct tightness test is not required if the air handler and all ducts are located within conditioned space!!!!!!!!!!!!!!!!!!!!!!
Piping Insulation R-3 required on (N1103.3) HVAC systems Exception: Piping that conveys fluids between 55 and 105 F R-2 required on (N1103.4) All circulating domestic hot water systems Systems also require a readily accessible manual switch
Ventilation and Equipment Sizing Ventilation (N1103.5) Outdoor air intakes and exhausts shall have automatic or gravity dampers that close when the ventilation system is not operating Equipment Sizing (N1103.6) Section M1401.3 of the IRC Load calculations determine the proper capacity (size) of equipment Goal is big enough to ensure comfort but no bigger Calculations shall be performed in accordance with ACCA Manual J or other approved methods Pg. 473
Snow Melt System Controls N1103.7 Snow- and ice-melting system controls Automatic shutoff when pavement temperature is > 50 F and no precipitation is falling Automatic or manual shutoff when outdoor temperature is > 40 F
Pools N1103.8 Pool heaters with a readily accessible on-off switch fired by natural gas not allowed to have continuously burning pilot lights Time switches to automatically turn off and on heaters and pumps according to a preset schedule installed on swimming pool heaters and pumps. Exceptions Public health standards requiring 24-hour pump operation Pumps operating pools with solar-waste-heat recovery heating systems
Pool Covers On heated pools If heated to >90 F, vapor-retardant pool cover at least R-12 Exception: If >60% of energy from site-recovered or solar energy source
Systems (IECC) Systems serving multiple dwelling units shall comply with Sections 503 and 504 in lieu of Section 403
Lighting Equipment IECC (Prescriptive) N1104.1 A minimum of 50 percent of the lamps in permanently installed lighting fixtures shall be high-efficacy lamps. (Amended out of IRC)
Compliance/Documentation/ Code Official has final authority Software, worksheets Above Code Programs Electronic media can be used Construction work for which a permit is required is subject to inspection Certificate is required Inspections
Compliance/Documentation/ Code Officials Inspection Successive and final inspections, and reinspections if necessary Code Validity Code deemed to be illegal or void shall not affect the remainder of the code Codes and standards considered part of the requirements of the code Provisions take precedence Fees Must be paid before permit is issued Required in accordance with schedule Inspections
Additions Treat as a stand-alone building Additions must meet the prescriptive requirements in Table 1102.1 or 402.1.1 (or U- factor or total UA alternatives) N
Sunrooms -IECC Less stringent insulation R-value and glazing U-factor requirements Sunroom definition: One story structure Glazing area >40% glazing of gross exterior wall and roof area Separate heating or cooling system or zone Must be thermally isolated (closeable doors or windows to the rest of the house) Can always meet Table 402.1.1 requirements with unlimited glass
Sunroom Requirements - IECC Ceiling Insulation Zones 5-8 R-24 Wall Insulation All zones R-13 Fenestration U-Factor Zones 4-8 0.50 Skylight U-Factor Zones 4-8 0.75
References The majority of slides were obtained and modified to fit local conditions from the U.S. Department of Energy Building Energy Codes Program presentations available at http://www.energycodes.gov/training/presentations.stm Yost, Y. and J. Lstiburek. 2002. Basement Insulation Systems. Building Sciences Corporation
Questions? Carl Pedersen www.ndsu.edu/energy Carl.pedersen@ndsu.edu (701) 231-5833